org.eigenbase.sql2rel
Class SqlToRelConverter.NullDefaultValueFactory

java.lang.Object
  org.eigenbase.sql2rel.SqlToRelConverter.NullDefaultValueFactory

All Implemented Interfaces:

DefaultValueFactory

Enclosing class:

SqlToRelConverter

 class SqlToRelConverter.NullDefaultValueFactory
extends Object
implements DefaultValueFactory

An implementation of DefaultValueFactory which always supplies NULL.

Constructor Summary

SqlToRelConverter.NullDefaultValueFactory()

Method Summary

boolean	isGeneratedAlways(RelOptTable table, int iColumn) Whether a column is always generated.
RexNode	newAttributeInitializer(RelDataType type, SqlFunction constructor, int iAttribute, RexNode[] constructorArgs) Creates an expression which evaluates to the initializer expression for a particular attribute of a structured type.
RexNode	newColumnDefaultValue(RelOptTable table, int iColumn) Creates an expression which evaluates to the default value for a particular column.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SqlToRelConverter.NullDefaultValueFactory

SqlToRelConverter.NullDefaultValueFactory()

Method Detail

isGeneratedAlways

public boolean isGeneratedAlways(RelOptTable table,
                                 int iColumn)

Description copied from interface: DefaultValueFactory

Whether a column is always generated. If a column is always generated, then non-generated values cannot be inserted into the column.

Specified by:

isGeneratedAlways in interface DefaultValueFactory

newColumnDefaultValue

public RexNode newColumnDefaultValue(RelOptTable table,
                                     int iColumn)

Description copied from interface: DefaultValueFactory

Creates an expression which evaluates to the default value for a particular column.

Specified by:

newColumnDefaultValue in interface DefaultValueFactory

Parameters:

table - the table containing the column

iColumn - the 0-based offset of the column in the table

Returns:

default value expression

newAttributeInitializer

public RexNode newAttributeInitializer(RelDataType type,
                                       SqlFunction constructor,
                                       int iAttribute,
                                       RexNode[] constructorArgs)

Description copied from interface: DefaultValueFactory

Creates an expression which evaluates to the initializer expression for a particular attribute of a structured type.

Specified by:

newAttributeInitializer in interface DefaultValueFactory

Parameters:

type - the structured type

constructor - the constructor invoked to initialize the type

iAttribute - the 0-based offset of the attribute in the type

constructorArgs - arguments passed to the constructor invocation

Returns:

default value expression